$(function() {
	// Hide Header on on scroll down
	var didScroll;
	var lastScrollTop = 0;
	var startScrollTop = 151;
	var delta = 5;
	var navbarHeight;

	$(window).scroll(function(event){
	  didScroll = true;
	  navbarHeight = $('.navbar-fixed-animate').outerHeight();
	});

	setInterval(function() {
    if (didScroll) {
      hasScrolled();
      didScroll = false;
    }
	}, 250);

	function hasScrolled() {
	  var st = $(this).scrollTop();

    // Make sure they scroll more than delta
    if(Math.abs(lastScrollTop - st) <= delta)
      return;

    // If they scrolled down and are past the navbar, add class .nav-up.
    // This is necessary so you never see what is "behind" the navbar.
    if (st > lastScrollTop && st > navbarHeight){
      // Scroll Down
      $('.navbar-fixed-animate').removeClass('nav-down').addClass('nav-up');
    } else {
      // Scroll Up
      if(st + $(window).height() < $(document).height()) {
        $('.navbar-fixed-animate').removeClass('nav-up').addClass('nav-down');
      }
    }

    lastScrollTop = st;
	}
});
